Here are a few programs which haven't been mentioned here before. They take C/C++ code and compile it to FPGAs, which might be interesting to someone who's working on, oh, say RC5... The first is at http://www.eecg.toronto.edu/EECG/RESEARCH/tmcc/tmcc/ and compiles C code to Xilinx or Altera FPGAs. Another is at ftp://lslsun5.epfl.ch/pub/nlc* It uses a slightly different syntax and targets Xilinx chips. There's also a routing optimizer at http://www.eecg.toronto.edu/~lemieux/sega/sega.html http://193.215.128.3/freecore/ gives plans for building a programmer to load designs into Altera FPGAs. While I not sure how well-optimized the output from such software is, it is interesting to note that someone with relatively basic electronics and computer programming experience could put together a massively parallel key-cracker.